Natsuki Rio roles
Anime
Rio has done the following roles in anime.
| Aika [1997-1999] | White B |
| Aika [1997-1999] | White Delmo N |
| Air Master [2003] | Seriguchi Tomiko |
| Battle Athletess Dai Undoukai | Kanzaki Akari |
| Bubble Gum Crisis Tokyo 2040 | Linna |
| CLAMP Gakuen Tanteidan {Episode 1} | girl A |
| Digimon Adventure 02 | Inoue Miyako |
| El Hazard | Jinnai Nanami |
| Fighbird [debut] | ? |
| Full Metal Panic! [2001] | Kagurazaka Eri |
| Gankutsuou | ? |
| Gankutsuou | Michelle |
| Geneshaft | Sybil |
| Geneshaft | Ryoko Burning |
| Geneshaft | Gloria |
| GetBackers [2002] | Heaven |
| Hi no Tori TV {The Future} | female |
| Hikari to Mizu no Daphne -Daphne in the Brilliant Blue- [2004] | Yukari's mother |
| Hyper Police {Episode 16} | Shimoda |
| K-On Movie [2010] | Yui's mother |
| Kaikan Phrase | Yumi |
| Kishin Taisen Gigantic Formula [2007] | Mizoguchi Michiru |
| Macross 7 | Miho |
| Might Gaine | Audrey |
| Misutenaide Daisy | Tami |
| Princess Minerva | Orlin Carrie |
| Samurai 7 [2004] | Waarya |
| Samurai 7 [2004] | Waarya |
| SD Gundam Gaiden Seikihei Monogatari | Matilda |
| Shadow | Karyuu |
| Shingetsutan Tsukihime | female newscaster |
| Shugo Chara! [2007-2009] | Sanjou Yukari |
| Shura no Toki | Waarya |
| Yuki no Joou (The Snow Queen) | Kai |
| Yuki no Joou (The Snow Queen) | Kai |
Games
Rio has done the following roles in games.
| Boys Be Second Season [Playstation] | Ijuuin Erika |
| Dai Undoukai [Sega Saturn] | Kanzaki Akari |
| Desire [Sega Saturn] | Sylvia Brother |
| DIRGE of CERBERUS -FINAL FANTASY VII- [PlayStation 2] | Lukuretsua |
| El Hazard [Sega Saturn] | Jinnai Nanami |
| Final Fantasy X [PlayStation 2] | Lulu |
| Final Fantasy X-2 [Playstation 2] | Ruuruu |
| Himikoden -Renge- [PlayStation] | Suzu |
| L no Kisetsu [Playstation] | Kourui Ririsu |
| Macross Digital Mission VF-X [Playstation] | Miho Miho |
| Melty Blood [] | Shion |
| Super Monkey Ball [GameCube] | Baby |
| To Heart 2 [PlayStation 2] | ? |
| True Love Story 2 [Playstation] | Hatano Aoi |
| Zenkoku Seifuku Bishoujo Grand Prix -Find Love [Sega Saturn] | ? |
Drama
Rio has done the following roles in audio drama.
| Cinematic Sound Drama GetBackers [CD] | ? |
| Desire [CD] | Sylvia Brother |
| El Hazard [CD] | Jinnai Nanami |
| Himikoden -Renge- [CD] | Suzu |
| Izumi Gensenki -Meidouhen- [CD] | woman |
| Macross 7 CD Cinema [CD] | ? |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 17} | Anita |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 5} | computer voice |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 6,12} | joshikousei |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 5,16} | Miho |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 19} | street voice |
| Macross 7 Docking Festival -Uta ha ginga wo sukuu- [CD] {Track 4} | tourist |